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sys/netinet6/in6.c
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1 /* $FreeBSD: releng/6.0/sys/netinet6/in6.c 151947 2005-11-01 22:42:05Z suz $ */ 2 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 4. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in.c 8.2 (Berkeley) 11/15/93 62 */ 63 64 #include "opt_inet.h" 65 #include "opt_inet6.h" 66 67 #include <sys/param.h> 68 #include <sys/errno.h> 69 #include <sys/malloc.h> 70 #include <sys/socket.h> 71 #include <sys/socketvar.h> 72 #include <sys/sockio.h> 73 #include <sys/systm.h> 74 #include <sys/proc.h> 75 #include <sys/time.h> 76 #include <sys/kernel.h> 77 #include <sys/syslog.h> 78 79 #include <net/if.h> 80 #include <net/if_types.h> 81 #include <net/route.h> 82 #include <net/if_dl.h> 83 84 #include <netinet/in.h> 85 #include <netinet/in_var.h> 86 #include <netinet/if_ether.h> 87 #include <netinet/in_systm.h> 88 #include <netinet/ip.h> 89 #include <netinet/in_pcb.h> 90 91 #include <netinet/ip6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet6/nd6.h> 94 #include <netinet6/mld6_var.h> 95 #include <netinet6/ip6_mroute.h> 96 #include <netinet6/in6_ifattach.h> 97 #include <netinet6/scope6_var.h> 98 #include <netinet6/in6_pcb.h> 99 100 #include <net/net_osdep.h> 101 102 MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address"); 103 104 /* 105 * Definitions of some costant IP6 addresses. 106 */ 107 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 108 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 109 const struct in6_addr in6addr_nodelocal_allnodes = 110 IN6ADDR_NODELOCAL_ALLNODES_INIT; 111 const struct in6_addr in6addr_linklocal_allnodes = 112 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 113 const struct in6_addr in6addr_linklocal_allrouters = 114 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 115 116 const struct in6_addr in6mask0 = IN6MASK0; 117 const struct in6_addr in6mask32 = IN6MASK32; 118 const struct in6_addr in6mask64 = IN6MASK64; 119 const struct in6_addr in6mask96 = IN6MASK96; 120 const struct in6_addr in6mask128 = IN6MASK128; 121 122 const struct sockaddr_in6 sa6_any = 123 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 124 125 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, 126 struct ifnet *, struct thread *)); 127 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *, 128 struct sockaddr_in6 *, int)); 129 static void in6_unlink_ifa __P((struct in6_ifaddr *, struct ifnet *)); 130 131 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 132 int (*faithprefix_p)(struct in6_addr *); 133 134 /* 135 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 136 * This routine does actual work. 137 */ 138 static void 139 in6_ifloop_request(int cmd, struct ifaddr *ifa) 140 { 141 struct sockaddr_in6 all1_sa; 142 struct rtentry *nrt = NULL; 143 int e; 144 145 bzero(&all1_sa, sizeof(all1_sa)); 146 all1_sa.sin6_family = AF_INET6; 147 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 148 all1_sa.sin6_addr = in6mask128; 149 150 /* 151 * We specify the address itself as the gateway, and set the 152 * RTF_LLINFO flag, so that the corresponding host route would have 153 * the flag, and thus applications that assume traditional behavior 154 * would be happy. Note that we assume the caller of the function 155 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 156 * which changes the outgoing interface to the loopback interface. 157 */ 158 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 159 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 160 if (e != 0) { 161 /* XXX need more descriptive message */ 162 log(LOG_ERR, "in6_ifloop_request: " 163 "%s operation failed for %s (errno=%d)\n", 164 cmd == RTM_ADD ? "ADD" : "DELETE", 165 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 166 e); 167 } 168 169 if (nrt) { 170 RT_LOCK(nrt); 171 /* 172 * Make sure rt_ifa be equal to IFA, the second argument of 173 * the function. We need this because when we refer to 174 * rt_ifa->ia6_flags in ip6_input, we assume that the rt_ifa 175 * points to the address instead of the loopback address. 176 */ 177 if (cmd == RTM_ADD && ifa != nrt->rt_ifa) { 178 IFAFREE(nrt->rt_ifa); 179 IFAREF(ifa); 180 nrt->rt_ifa = ifa; 181 } 182 183 /* 184 * Report the addition/removal of the address to the routing 185 * socket. 186 * 187 * XXX: since we called rtinit for a p2p interface with a 188 * destination, we end up reporting twice in such a case. 189 * Should we rather omit the second report? 190 */ 191 rt_newaddrmsg(cmd, ifa, e, nrt); 192 if (cmd == RTM_DELETE) { 193 rtfree(nrt); 194 } else { 195 /* the cmd must be RTM_ADD here */ 196 RT_REMREF(nrt); 197 RT_UNLOCK(nrt); 198 } 199 } 200 } 201 202 /* 203 * Add ownaddr as loopback rtentry. We previously add the route only if 204 * necessary (ex. on a p2p link). However, since we now manage addresses 205 * separately from prefixes, we should always add the route. We can't 206 * rely on the cloning mechanism from the corresponding interface route 207 * any more. 208 */ 209 void 210 in6_ifaddloop(struct ifaddr *ifa) 211 { 212 struct rtentry *rt; 213 int need_loop; 214 215 /* If there is no loopback entry, allocate one. */ 216 rt = rtalloc1(ifa->ifa_addr, 0, 0); 217 need_loop = (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 218 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0); 219 if (rt) 220 rtfree(rt); 221 if (need_loop) 222 in6_ifloop_request(RTM_ADD, ifa); 223 } 224 225 /* 226 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 227 * if it exists. 228 */ 229 void 230 in6_ifremloop(struct ifaddr *ifa) 231 { 232 struct in6_ifaddr *ia; 233 struct rtentry *rt; 234 int ia_count = 0; 235 236 /* 237 * Some of BSD variants do not remove cloned routes 238 * from an interface direct route, when removing the direct route 239 * (see comments in net/net_osdep.h). Even for variants that do remove 240 * cloned routes, they could fail to remove the cloned routes when 241 * we handle multple addresses that share a common prefix. 242 * So, we should remove the route corresponding to the deleted address 243 * regardless of the result of in6_is_ifloop_auto(). 244 */ 245 246 /* 247 * Delete the entry only if exact one ifa exists. More than one ifa 248 * can exist if we assign a same single address to multiple 249 * (probably p2p) interfaces. 250 * XXX: we should avoid such a configuration in IPv6... 251 */ 252 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 253 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 254 ia_count++; 255 if (ia_count > 1) 256 break; 257 } 258 } 259 260 if (ia_count == 1) { 261 /* 262 * Before deleting, check if a corresponding loopbacked host 263 * route surely exists. With this check, we can avoid to 264 * delete an interface direct route whose destination is same 265 * as the address being removed. This can happen when removing 266 * a subnet-router anycast address on an interface attahced 267 * to a shared medium. 268 */ 269 rt = rtalloc1(ifa->ifa_addr, 0, 0); 270 if (rt != NULL) { 271 if ((rt->rt_flags & RTF_HOST) != 0 && 272 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) { 273 rtfree(rt); 274 in6_ifloop_request(RTM_DELETE, ifa); 275 } else 276 RT_UNLOCK(rt); 277 } 278 } 279 } 280 281 int 282 in6_mask2len(mask, lim0) 283 struct in6_addr *mask; 284 u_char *lim0; 285 { 286 int x = 0, y; 287 u_char *lim = lim0, *p; 288 289 /* ignore the scope_id part */ 290 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 291 lim = (u_char *)mask + sizeof(*mask); 292 for (p = (u_char *)mask; p < lim; x++, p++) { 293 if (*p != 0xff) 294 break; 295 } 296 y = 0; 297 if (p < lim) { 298 for (y = 0; y < 8; y++) { 299 if ((*p & (0x80 >> y)) == 0) 300 break; 301 } 302 } 303 304 /* 305 * when the limit pointer is given, do a stricter check on the 306 * remaining bits. 307 */ 308 if (p < lim) { 309 if (y != 0 && (*p & (0x00ff >> y)) != 0) 310 return (-1); 311 for (p = p + 1; p < lim; p++) 312 if (*p != 0) 313 return (-1); 314 } 315 316 return x * 8 + y; 317 } 318 319 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 320 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 321 322 int 323 in6_control(so, cmd, data, ifp, td) 324 struct socket *so; 325 u_long cmd; 326 caddr_t data; 327 struct ifnet *ifp; 328 struct thread *td; 329 { 330 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 331 struct in6_ifaddr *ia = NULL; 332 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 333 int privileged; 334 335 privileged = 0; 336 if (td == NULL || !suser(td)) 337 privileged++; 338 339 switch (cmd) { 340 case SIOCGETSGCNT_IN6: 341 case SIOCGETMIFCNT_IN6: 342 return (mrt6_ioctl(cmd, data)); 343 } 344 345 switch(cmd) { 346 case SIOCAADDRCTL_POLICY: 347 case SIOCDADDRCTL_POLICY: 348 if (!privileged) 349 return (EPERM); 350 return (in6_src_ioctl(cmd, data)); 351 } 352 353 if (ifp == NULL) 354 return (EOPNOTSUPP); 355 356 switch (cmd) { 357 case SIOCSNDFLUSH_IN6: 358 case SIOCSPFXFLUSH_IN6: 359 case SIOCSRTRFLUSH_IN6: 360 case SIOCSDEFIFACE_IN6: 361 case SIOCSIFINFO_FLAGS: 362 if (!privileged) 363 return (EPERM); 364 /* FALLTHROUGH */ 365 case OSIOCGIFINFO_IN6: 366 case SIOCGIFINFO_IN6: 367 case SIOCGDRLST_IN6: 368 case SIOCGPRLST_IN6: 369 case SIOCGNBRINFO_IN6: 370 case SIOCGDEFIFACE_IN6: 371 return (nd6_ioctl(cmd, data, ifp)); 372 } 373 374 switch (cmd) { 375 case SIOCSIFPREFIX_IN6: 376 case SIOCDIFPREFIX_IN6: 377 case SIOCAIFPREFIX_IN6: 378 case SIOCCIFPREFIX_IN6: 379 case SIOCSGIFPREFIX_IN6: 380 case SIOCGIFPREFIX_IN6: 381 log(LOG_NOTICE, 382 "prefix ioctls are now invalidated. " 383 "please use ifconfig.\n"); 384 return (EOPNOTSUPP); 385 } 386 387 switch (cmd) { 388 case SIOCSSCOPE6: 389 if (!privileged) 390 return (EPERM); 391 return (scope6_set(ifp, 392 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 393 case SIOCGSCOPE6: 394 return (scope6_get(ifp, 395 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 396 case SIOCGSCOPE6DEF: 397 return (scope6_get_default((struct scope6_id *) 398 ifr->ifr_ifru.ifru_scope_id)); 399 } 400 401 switch (cmd) { 402 case SIOCALIFADDR: 403 case SIOCDLIFADDR: 404 if (!privileged) 405 return (EPERM); 406 /* FALLTHROUGH */ 407 case SIOCGLIFADDR: 408 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 409 } 410 411 /* 412 * Find address for this interface, if it exists. 413 */ 414 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 415 struct sockaddr_in6 *sa6 = 416 (struct sockaddr_in6 *)&ifra->ifra_addr; 417 418 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 419 if (sa6->sin6_addr.s6_addr16[1] == 0) { 420 /* link ID is not embedded by the user */ 421 sa6->sin6_addr.s6_addr16[1] = 422 htons(ifp->if_index); 423 } else if (sa6->sin6_addr.s6_addr16[1] != 424 htons(ifp->if_index)) { 425 return (EINVAL); /* link ID contradicts */ 426 } 427 if (sa6->sin6_scope_id) { 428 if (sa6->sin6_scope_id != 429 (u_int32_t)ifp->if_index) 430 return (EINVAL); 431 sa6->sin6_scope_id = 0; /* XXX: good way? */ 432 } 433 } 434 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 435 } 436 437 switch (cmd) { 438 case SIOCSIFADDR_IN6: 439 case SIOCSIFDSTADDR_IN6: 440 case SIOCSIFNETMASK_IN6: 441 /* 442 * Since IPv6 allows a node to assign multiple addresses 443 * on a single interface, SIOCSIFxxx ioctls are not suitable 444 * and should be unused. 445 */ 446 /* we decided to obsolete this command (20000704) */ 447 return (EINVAL); 448 449 case SIOCDIFADDR_IN6: 450 /* 451 * for IPv4, we look for existing in_ifaddr here to allow 452 * "ifconfig if0 delete" to remove first IPv4 address on the 453 * interface. For IPv6, as the spec allow multiple interface 454 * address from the day one, we consider "remove the first one" 455 * semantics to be not preferable. 456 */ 457 if (ia == NULL) 458 return (EADDRNOTAVAIL); 459 /* FALLTHROUGH */ 460 case SIOCAIFADDR_IN6: 461 /* 462 * We always require users to specify a valid IPv6 address for 463 * the corresponding operation. 464 */ 465 if (ifra->ifra_addr.sin6_family != AF_INET6 || 466 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 467 return (EAFNOSUPPORT); 468 if (!privileged) 469 return (EPERM); 470 471 break; 472 473 case SIOCGIFADDR_IN6: 474 /* This interface is basically deprecated. use SIOCGIFCONF. */ 475 /* FALLTHROUGH */ 476 case SIOCGIFAFLAG_IN6: 477 case SIOCGIFNETMASK_IN6: 478 case SIOCGIFDSTADDR_IN6: 479 case SIOCGIFALIFETIME_IN6: 480 /* must think again about its semantics */ 481 if (ia == NULL) 482 return (EADDRNOTAVAIL); 483 break; 484 case SIOCSIFALIFETIME_IN6: 485 { 486 struct in6_addrlifetime *lt; 487 488 if (!privileged) 489 return (EPERM); 490 if (ia == NULL) 491 return (EADDRNOTAVAIL); 492 /* sanity for overflow - beware unsigned */ 493 lt = &ifr->ifr_ifru.ifru_lifetime; 494 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 495 lt->ia6t_vltime + time_second < time_second) { 496 return EINVAL; 497 } 498 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 499 lt->ia6t_pltime + time_second < time_second) { 500 return EINVAL; 501 } 502 break; 503 } 504 } 505 506 switch (cmd) { 507 508 case SIOCGIFADDR_IN6: 509 ifr->ifr_addr = ia->ia_addr; 510 break; 511 512 case SIOCGIFDSTADDR_IN6: 513 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 514 return (EINVAL); 515 /* 516 * XXX: should we check if ifa_dstaddr is NULL and return 517 * an error? 518 */ 519 ifr->ifr_dstaddr = ia->ia_dstaddr; 520 break; 521 522 case SIOCGIFNETMASK_IN6: 523 ifr->ifr_addr = ia->ia_prefixmask; 524 break; 525 526 case SIOCGIFAFLAG_IN6: 527 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 528 break; 529 530 case SIOCGIFSTAT_IN6: 531 if (ifp == NULL) 532 return EINVAL; 533 bzero(&ifr->ifr_ifru.ifru_stat, 534 sizeof(ifr->ifr_ifru.ifru_stat)); 535 ifr->ifr_ifru.ifru_stat = 536 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 537 break; 538 539 case SIOCGIFSTAT_ICMP6: 540 if (ifp == NULL) 541 return EINVAL; 542 bzero(&ifr->ifr_ifru.ifru_stat, 543 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 544 ifr->ifr_ifru.ifru_icmp6stat = 545 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 546 break; 547 548 case SIOCGIFALIFETIME_IN6: 549 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 550 break; 551 552 case SIOCSIFALIFETIME_IN6: 553 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 554 /* for sanity */ 555 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 556 ia->ia6_lifetime.ia6t_expire = 557 time_second + ia->ia6_lifetime.ia6t_vltime; 558 } else 559 ia->ia6_lifetime.ia6t_expire = 0; 560 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 561 ia->ia6_lifetime.ia6t_preferred = 562 time_second + ia->ia6_lifetime.ia6t_pltime; 563 } else 564 ia->ia6_lifetime.ia6t_preferred = 0; 565 break; 566 567 case SIOCAIFADDR_IN6: 568 { 569 int i, error = 0; 570 struct nd_prefix pr0, *pr; 571 572 /* 573 * first, make or update the interface address structure, 574 * and link it to the list. 575 */ 576 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 577 return (error); 578 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 579 == NULL) { 580 /* 581 * this can happen when the user specify the 0 valid 582 * lifetime. 583 */ 584 break; 585 } 586 587 /* 588 * then, make the prefix on-link on the interface. 589 * XXX: we'd rather create the prefix before the address, but 590 * we need at least one address to install the corresponding 591 * interface route, so we configure the address first. 592 */ 593 594 /* 595 * convert mask to prefix length (prefixmask has already 596 * been validated in in6_update_ifa(). 597 */ 598 bzero(&pr0, sizeof(pr0)); 599 pr0.ndpr_ifp = ifp; 600 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 601 NULL); 602 if (pr0.ndpr_plen == 128) { 603 break; /* we don't need to install a host route. */ 604 } 605 pr0.ndpr_prefix = ifra->ifra_addr; 606 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 607 /* apply the mask for safety. */ 608 for (i = 0; i < 4; i++) { 609 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 610 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 611 } 612 /* 613 * XXX: since we don't have an API to set prefix (not address) 614 * lifetimes, we just use the same lifetimes as addresses. 615 * The (temporarily) installed lifetimes can be overridden by 616 * later advertised RAs (when accept_rtadv is non 0), which is 617 * an intended behavior. 618 */ 619 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 620 pr0.ndpr_raf_auto = 621 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 622 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 623 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 624 625 /* add the prefix if not yet. */ 626 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 627 /* 628 * nd6_prelist_add will install the corresponding 629 * interface route. 630 */ 631 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 632 return (error); 633 if (pr == NULL) { 634 log(LOG_ERR, "nd6_prelist_add succeeded but " 635 "no prefix\n"); 636 return (EINVAL); /* XXX panic here? */ 637 } 638 } 639 /* relate the address to the prefix */ 640 if (ia->ia6_ndpr == NULL) { 641 ia->ia6_ndpr = pr; 642 pr->ndpr_refcnt++; 643 644 /* 645 * If this is the first autoconf address from the 646 * prefix, create a temporary address as well 647 * (when required). 648 */ 649 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 650 ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 651 int e; 652 if ((e = in6_tmpifadd(ia, 1)) != 0) { 653 log(LOG_NOTICE, "in6_control: failed " 654 "to create a temporary address, " 655 "errno=%d\n", e); 656 } 657 } 658 } 659 660 /* 661 * this might affect the status of autoconfigured addresses, 662 * that is, this address might make other addresses detached. 663 */ 664 pfxlist_onlink_check(); 665 if (error == 0 && ia) 666 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 667 break; 668 } 669 670 case SIOCDIFADDR_IN6: 671 { 672 struct nd_prefix *pr; 673 674 /* 675 * If the address being deleted is the only one that owns 676 * the corresponding prefix, expire the prefix as well. 677 * XXX: theoretically, we don't have to worry about such 678 * relationship, since we separate the address management 679 * and the prefix management. We do this, however, to provide 680 * as much backward compatibility as possible in terms of 681 * the ioctl operation. 682 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 683 */ 684 pr = ia->ia6_ndpr; 685 in6_purgeaddr(&ia->ia_ifa); 686 if (pr && pr->ndpr_refcnt == 0) 687 prelist_remove(pr); 688 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 689 break; 690 } 691 692 default: 693 if (ifp == NULL || ifp->if_ioctl == 0) 694 return (EOPNOTSUPP); 695 return ((*ifp->if_ioctl)(ifp, cmd, data)); 696 } 697 698 return (0); 699 } 700 701 /* 702 * Update parameters of an IPv6 interface address. 703 * If necessary, a new entry is created and linked into address chains. 704 * This function is separated from in6_control(). 705 * XXX: should this be performed under splnet()? 706 */ 707 int 708 in6_update_ifa(ifp, ifra, ia) 709 struct ifnet *ifp; 710 struct in6_aliasreq *ifra; 711 struct in6_ifaddr *ia; 712 { 713 int error = 0, hostIsNew = 0, plen = -1; 714 struct in6_ifaddr *oia; 715 struct sockaddr_in6 dst6; 716 struct in6_addrlifetime *lt; 717 718 /* Validate parameters */ 719 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 720 return (EINVAL); 721 722 /* 723 * The destination address for a p2p link must have a family 724 * of AF_UNSPEC or AF_INET6. 725 */ 726 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 727 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 728 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 729 return (EAFNOSUPPORT); 730 /* 731 * validate ifra_prefixmask. don't check sin6_family, netmask 732 * does not carry fields other than sin6_len. 733 */ 734 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 735 return (EINVAL); 736 /* 737 * Because the IPv6 address architecture is classless, we require 738 * users to specify a (non 0) prefix length (mask) for a new address. 739 * We also require the prefix (when specified) mask is valid, and thus 740 * reject a non-consecutive mask. 741 */ 742 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 743 return (EINVAL); 744 if (ifra->ifra_prefixmask.sin6_len != 0) { 745 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 746 (u_char *)&ifra->ifra_prefixmask + 747 ifra->ifra_prefixmask.sin6_len); 748 if (plen <= 0) 749 return (EINVAL); 750 } else { 751 /* 752 * In this case, ia must not be NULL. We just use its prefix 753 * length. 754 */ 755 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 756 } 757 /* 758 * If the destination address on a p2p interface is specified, 759 * and the address is a scoped one, validate/set the scope 760 * zone identifier. 761 */ 762 dst6 = ifra->ifra_dstaddr; 763 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 764 (dst6.sin6_family == AF_INET6)) { 765 u_int32_t zoneid; 766 767 if ((error = in6_recoverscope(&dst6, 768 &ifra->ifra_dstaddr.sin6_addr, ifp)) != 0) 769 return (error); 770 if (in6_addr2zoneid(ifp, &dst6.sin6_addr, &zoneid)) 771 return (EINVAL); 772 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 773 dst6.sin6_scope_id = zoneid; 774 else if (dst6.sin6_scope_id != zoneid) 775 return (EINVAL); /* scope ID mismatch. */ 776 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 777 != 0) 778 return (error); 779 dst6.sin6_scope_id = 0; /* XXX */ 780 } 781 /* 782 * The destination address can be specified only for a p2p or a 783 * loopback interface. If specified, the corresponding prefix length 784 * must be 128. 785 */ 786 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 787 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 788 /* XXX: noisy message */ 789 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 790 "be specified for a p2p or a loopback IF only\n")); 791 return (EINVAL); 792 } 793 if (plen != 128) { 794 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 795 "be 128 when dstaddr is specified\n")); 796 return (EINVAL); 797 } 798 } 799 /* lifetime consistency check */ 800 lt = &ifra->ifra_lifetime; 801 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 802 && lt->ia6t_vltime + time_second < time_second) { 803 return EINVAL; 804 } 805 if (lt->ia6t_vltime == 0) { 806 /* 807 * the following log might be noisy, but this is a typical 808 * configuration mistake or a tool's bug. 809 */ 810 nd6log((LOG_INFO, 811 "in6_update_ifa: valid lifetime is 0 for %s\n", 812 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 813 } 814 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 815 && lt->ia6t_pltime + time_second < time_second) { 816 return EINVAL; 817 } 818 819 /* 820 * If this is a new address, allocate a new ifaddr and link it 821 * into chains. 822 */ 823 if (ia == NULL) { 824 hostIsNew = 1; 825 /* 826 * When in6_update_ifa() is called in a process of a received 827 * RA, it is called under an interrupt context. So, we should 828 * call malloc with M_NOWAIT. 829 */ 830 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 831 M_NOWAIT); 832 if (ia == NULL) 833 return (ENOBUFS); 834 bzero((caddr_t)ia, sizeof(*ia)); 835 /* Initialize the address and masks */ 836 IFA_LOCK_INIT(&ia->ia_ifa); 837 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 838 ia->ia_addr.sin6_family = AF_INET6; 839 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 840 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 841 /* 842 * XXX: some functions expect that ifa_dstaddr is not 843 * NULL for p2p interfaces. 844 */ 845 ia->ia_ifa.ifa_dstaddr = 846 (struct sockaddr *)&ia->ia_dstaddr; 847 } else { 848 ia->ia_ifa.ifa_dstaddr = NULL; 849 } 850 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 851 852 ia->ia_ifp = ifp; 853 if ((oia = in6_ifaddr) != NULL) { 854 for ( ; oia->ia_next; oia = oia->ia_next) 855 continue; 856 oia->ia_next = ia; 857 } else 858 in6_ifaddr = ia; 859 860 ia->ia_ifa.ifa_refcnt = 1; 861 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 862 } 863 864 /* set prefix mask */ 865 if (ifra->ifra_prefixmask.sin6_len) { 866 /* 867 * We prohibit changing the prefix length of an existing 868 * address, because 869 * + such an operation should be rare in IPv6, and 870 * + the operation would confuse prefix management. 871 */ 872 if (ia->ia_prefixmask.sin6_len && 873 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 874 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 875 " existing (%s) address should not be changed\n", 876 ip6_sprintf(&ia->ia_addr.sin6_addr))); 877 error = EINVAL; 878 goto unlink; 879 } 880 ia->ia_prefixmask = ifra->ifra_prefixmask; 881 } 882 883 /* 884 * If a new destination address is specified, scrub the old one and 885 * install the new destination. Note that the interface must be 886 * p2p or loopback (see the check above.) 887 */ 888 if (dst6.sin6_family == AF_INET6 && 889 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 890 int e; 891 892 if ((ia->ia_flags & IFA_ROUTE) != 0 && 893 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 894 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 895 "a route to the old destination: %s\n", 896 ip6_sprintf(&ia->ia_addr.sin6_addr))); 897 /* proceed anyway... */ 898 } else 899 ia->ia_flags &= ~IFA_ROUTE; 900 ia->ia_dstaddr = dst6; 901 } 902 903 /* reset the interface and routing table appropriately. */ 904 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 905 goto unlink; 906 907 /* 908 * Beyond this point, we should call in6_purgeaddr upon an error, 909 * not just go to unlink. 910 */ 911 912 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 913 struct sockaddr_in6 mltaddr, mltmask; 914 struct in6_multi *in6m; 915 916 if (hostIsNew) { 917 /* join solicited multicast addr for new host id */ 918 struct in6_addr llsol; 919 920 bzero(&llsol, sizeof(struct in6_addr)); 921 llsol.s6_addr16[0] = htons(0xff02); 922 llsol.s6_addr16[1] = htons(ifp->if_index); 923 llsol.s6_addr32[1] = 0; 924 llsol.s6_addr32[2] = htonl(1); 925 llsol.s6_addr32[3] = 926 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 927 llsol.s6_addr8[12] = 0xff; 928 (void)in6_addmulti(&llsol, ifp, &error); 929 if (error != 0) { 930 nd6log((LOG_WARNING, 931 "in6_update_ifa: addmulti failed for " 932 "%s on %s (errno=%d)\n", 933 ip6_sprintf(&llsol), if_name(ifp), 934 error)); 935 in6_purgeaddr((struct ifaddr *)ia); 936 return (error); 937 } 938 } 939 940 bzero(&mltmask, sizeof(mltmask)); 941 mltmask.sin6_len = sizeof(struct sockaddr_in6); 942 mltmask.sin6_family = AF_INET6; 943 mltmask.sin6_addr = in6mask32; 944 945 /* 946 * join link-local all-nodes address 947 */ 948 bzero(&mltaddr, sizeof(mltaddr)); 949 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 950 mltaddr.sin6_family = AF_INET6; 951 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 952 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 953 954 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 955 if (in6m == NULL) { 956 rtrequest(RTM_ADD, 957 (struct sockaddr *)&mltaddr, 958 (struct sockaddr *)&ia->ia_addr, 959 (struct sockaddr *)&mltmask, 960 RTF_UP|RTF_CLONING, /* xxx */ 961 (struct rtentry **)0); 962 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 963 if (error != 0) { 964 nd6log((LOG_WARNING, 965 "in6_update_ifa: addmulti failed for " 966 "%s on %s (errno=%d)\n", 967 ip6_sprintf(&mltaddr.sin6_addr), 968 if_name(ifp), error)); 969 } 970 } 971 972 /* 973 * join node information group address 974 */ 975 #define hostnamelen strlen(hostname) 976 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 977 == 0) { 978 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 979 if (in6m == NULL && ia != NULL) { 980 (void)in6_addmulti(&mltaddr.sin6_addr, 981 ifp, &error); 982 if (error != 0) { 983 nd6log((LOG_WARNING, "in6_update_ifa: " 984 "addmulti failed for " 985 "%s on %s (errno=%d)\n", 986 ip6_sprintf(&mltaddr.sin6_addr), 987 if_name(ifp), error)); 988 } 989 } 990 } 991 #undef hostnamelen 992 993 /* 994 * join node-local all-nodes address, on loopback. 995 * XXX: since "node-local" is obsoleted by interface-local, 996 * we have to join the group on every interface with 997 * some interface-boundary restriction. 998 */ 999 if (ifp->if_flags & IFF_LOOPBACK) { 1000 struct in6_ifaddr *ia_loop; 1001 1002 struct in6_addr loop6 = in6addr_loopback; 1003 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1004 1005 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1006 1007 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1008 if (in6m == NULL && ia_loop != NULL) { 1009 rtrequest(RTM_ADD, 1010 (struct sockaddr *)&mltaddr, 1011 (struct sockaddr *)&ia_loop->ia_addr, 1012 (struct sockaddr *)&mltmask, 1013 RTF_UP, 1014 (struct rtentry **)0); 1015 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, 1016 &error); 1017 if (error != 0) { 1018 nd6log((LOG_WARNING, "in6_update_ifa: " 1019 "addmulti failed for %s on %s " 1020 "(errno=%d)\n", 1021 ip6_sprintf(&mltaddr.sin6_addr), 1022 if_name(ifp), error)); 1023 } 1024 } 1025 } 1026 } 1027 1028 ia->ia6_flags = ifra->ifra_flags; 1029 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1030 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1031 1032 ia->ia6_lifetime = ifra->ifra_lifetime; 1033 /* for sanity */ 1034 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1035 ia->ia6_lifetime.ia6t_expire = 1036 time_second + ia->ia6_lifetime.ia6t_vltime; 1037 } else 1038 ia->ia6_lifetime.ia6t_expire = 0; 1039 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1040 ia->ia6_lifetime.ia6t_preferred = 1041 time_second + ia->ia6_lifetime.ia6t_pltime; 1042 } else 1043 ia->ia6_lifetime.ia6t_preferred = 0; 1044 1045 /* 1046 * Perform DAD, if needed. 1047 * XXX It may be of use, if we can administratively 1048 * disable DAD. 1049 */ 1050 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) { 1051 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1052 nd6_dad_start((struct ifaddr *)ia, NULL); 1053 } 1054 1055 return (error); 1056 1057 unlink: 1058 /* 1059 * XXX: if a change of an existing address failed, keep the entry 1060 * anyway. 1061 */ 1062 if (hostIsNew) 1063 in6_unlink_ifa(ia, ifp); 1064 return (error); 1065 } 1066 1067 void 1068 in6_purgeaddr(ifa) 1069 struct ifaddr *ifa; 1070 { 1071 struct ifnet *ifp = ifa->ifa_ifp; 1072 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1073 1074 /* stop DAD processing */ 1075 nd6_dad_stop(ifa); 1076 1077 /* 1078 * delete route to the destination of the address being purged. 1079 * The interface must be p2p or loopback in this case. 1080 */ 1081 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1082 int e; 1083 1084 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1085 != 0) { 1086 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1087 "a route to the p2p destination: %s on %s, " 1088 "errno=%d\n", 1089 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1090 e); 1091 /* proceed anyway... */ 1092 } else 1093 ia->ia_flags &= ~IFA_ROUTE; 1094 } 1095 1096 /* Remove ownaddr's loopback rtentry, if it exists. */ 1097 in6_ifremloop(&(ia->ia_ifa)); 1098 1099 if (ifp->if_flags & IFF_MULTICAST) { 1100 /* 1101 * delete solicited multicast addr for deleting host id 1102 */ 1103 struct in6_multi *in6m; 1104 struct in6_addr llsol; 1105 bzero(&llsol, sizeof(struct in6_addr)); 1106 llsol.s6_addr16[0] = htons(0xff02); 1107 llsol.s6_addr16[1] = htons(ifp->if_index); 1108 llsol.s6_addr32[1] = 0; 1109 llsol.s6_addr32[2] = htonl(1); 1110 llsol.s6_addr32[3] = 1111 ia->ia_addr.sin6_addr.s6_addr32[3]; 1112 llsol.s6_addr8[12] = 0xff; 1113 1114 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1115 if (in6m) 1116 in6_delmulti(in6m); 1117 } 1118 1119 in6_unlink_ifa(ia, ifp); 1120 } 1121 1122 static void 1123 in6_unlink_ifa(ia, ifp) 1124 struct in6_ifaddr *ia; 1125 struct ifnet *ifp; 1126 { 1127 struct in6_ifaddr *oia; 1128 int s = splnet(); 1129 1130 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1131 1132 oia = ia; 1133 if (oia == (ia = in6_ifaddr)) 1134 in6_ifaddr = ia->ia_next; 1135 else { 1136 while (ia->ia_next && (ia->ia_next != oia)) 1137 ia = ia->ia_next; 1138 if (ia->ia_next) 1139 ia->ia_next = oia->ia_next; 1140 else { 1141 /* search failed */ 1142 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1143 } 1144 } 1145 1146 /* 1147 * Release the reference to the base prefix. There should be a 1148 * positive reference. 1149 */ 1150 if (oia->ia6_ndpr == NULL) { 1151 nd6log((LOG_NOTICE, 1152 "in6_unlink_ifa: autoconf'ed address " 1153 "%p has no prefix\n", oia)); 1154 } else { 1155 oia->ia6_ndpr->ndpr_refcnt--; 1156 oia->ia6_ndpr = NULL; 1157 } 1158 1159 /* 1160 * Also, if the address being removed is autoconf'ed, call 1161 * pfxlist_onlink_check() since the release might affect the status of 1162 * other (detached) addresses. 1163 */ 1164 if ((oia->ia6_flags & IN6_IFF_AUTOCONF)) { 1165 pfxlist_onlink_check(); 1166 } 1167 1168 /* 1169 * release another refcnt for the link from in6_ifaddr. 1170 * Note that we should decrement the refcnt at least once for all *BSD. 1171 */ 1172 IFAFREE(&oia->ia_ifa); 1173 1174 splx(s); 1175 } 1176 1177 void 1178 in6_purgeif(ifp) 1179 struct ifnet *ifp; 1180 { 1181 struct ifaddr *ifa, *nifa; 1182 1183 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 1184 nifa = TAILQ_NEXT(ifa, ifa_list); 1185 if (ifa->ifa_addr->sa_family != AF_INET6) 1186 continue; 1187 in6_purgeaddr(ifa); 1188 } 1189 1190 in6_ifdetach(ifp); 1191 } 1192 1193 /* 1194 * SIOC[GAD]LIFADDR. 1195 * SIOCGLIFADDR: get first address. (?) 1196 * SIOCGLIFADDR with IFLR_PREFIX: 1197 * get first address that matches the specified prefix. 1198 * SIOCALIFADDR: add the specified address. 1199 * SIOCALIFADDR with IFLR_PREFIX: 1200 * add the specified prefix, filling hostid part from 1201 * the first link-local address. prefixlen must be <= 64. 1202 * SIOCDLIFADDR: delete the specified address. 1203 * SIOCDLIFADDR with IFLR_PREFIX: 1204 * delete the first address that matches the specified prefix. 1205 * return values: 1206 * EINVAL on invalid parameters 1207 * EADDRNOTAVAIL on prefix match failed/specified address not found 1208 * other values may be returned from in6_ioctl() 1209 * 1210 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1211 * this is to accomodate address naming scheme other than RFC2374, 1212 * in the future. 1213 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1214 * address encoding scheme. (see figure on page 8) 1215 */ 1216 static int 1217 in6_lifaddr_ioctl(so, cmd, data, ifp, td) 1218 struct socket *so; 1219 u_long cmd; 1220 caddr_t data; 1221 struct ifnet *ifp; 1222 struct thread *td; 1223 { 1224 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1225 struct ifaddr *ifa; 1226 struct sockaddr *sa; 1227 1228 /* sanity checks */ 1229 if (!data || !ifp) { 1230 panic("invalid argument to in6_lifaddr_ioctl"); 1231 /* NOTREACHED */ 1232 } 1233 1234 switch (cmd) { 1235 case SIOCGLIFADDR: 1236 /* address must be specified on GET with IFLR_PREFIX */ 1237 if ((iflr->flags & IFLR_PREFIX) == 0) 1238 break; 1239 /* FALLTHROUGH */ 1240 case SIOCALIFADDR: 1241 case SIOCDLIFADDR: 1242 /* address must be specified on ADD and DELETE */ 1243 sa = (struct sockaddr *)&iflr->addr; 1244 if (sa->sa_family != AF_INET6) 1245 return EINVAL; 1246 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1247 return EINVAL; 1248 /* XXX need improvement */ 1249 sa = (struct sockaddr *)&iflr->dstaddr; 1250 if (sa->sa_family && sa->sa_family != AF_INET6) 1251 return EINVAL; 1252 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1253 return EINVAL; 1254 break; 1255 default: /* shouldn't happen */ 1256 #if 0 1257 panic("invalid cmd to in6_lifaddr_ioctl"); 1258 /* NOTREACHED */ 1259 #else 1260 return EOPNOTSUPP; 1261 #endif 1262 } 1263 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1264 return EINVAL; 1265 1266 switch (cmd) { 1267 case SIOCALIFADDR: 1268 { 1269 struct in6_aliasreq ifra; 1270 struct in6_addr *hostid = NULL; 1271 int prefixlen; 1272 1273 if ((iflr->flags & IFLR_PREFIX) != 0) { 1274 struct sockaddr_in6 *sin6; 1275 1276 /* 1277 * hostid is to fill in the hostid part of the 1278 * address. hostid points to the first link-local 1279 * address attached to the interface. 1280 */ 1281 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1282 if (!ifa) 1283 return EADDRNOTAVAIL; 1284 hostid = IFA_IN6(ifa); 1285 1286 /* prefixlen must be <= 64. */ 1287 if (64 < iflr->prefixlen) 1288 return EINVAL; 1289 prefixlen = iflr->prefixlen; 1290 1291 /* hostid part must be zero. */ 1292 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1293 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1294 sin6->sin6_addr.s6_addr32[3] != 0) { 1295 return EINVAL; 1296 } 1297 } else 1298 prefixlen = iflr->prefixlen; 1299 1300 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1301 bzero(&ifra, sizeof(ifra)); 1302 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1303 1304 bcopy(&iflr->addr, &ifra.ifra_addr, 1305 ((struct sockaddr *)&iflr->addr)->sa_len); 1306 if (hostid) { 1307 /* fill in hostid part */ 1308 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1309 hostid->s6_addr32[2]; 1310 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1311 hostid->s6_addr32[3]; 1312 } 1313 1314 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1315 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1316 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1317 if (hostid) { 1318 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1319 hostid->s6_addr32[2]; 1320 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1321 hostid->s6_addr32[3]; 1322 } 1323 } 1324 1325 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1326 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1327 1328 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1329 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1330 } 1331 case SIOCGLIFADDR: 1332 case SIOCDLIFADDR: 1333 { 1334 struct in6_ifaddr *ia; 1335 struct in6_addr mask, candidate, match; 1336 struct sockaddr_in6 *sin6; 1337 int cmp; 1338 1339 bzero(&mask, sizeof(mask)); 1340 if (iflr->flags & IFLR_PREFIX) { 1341 /* lookup a prefix rather than address. */ 1342 in6_prefixlen2mask(&mask, iflr->prefixlen); 1343 1344 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1345 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1346 match.s6_addr32[0] &= mask.s6_addr32[0]; 1347 match.s6_addr32[1] &= mask.s6_addr32[1]; 1348 match.s6_addr32[2] &= mask.s6_addr32[2]; 1349 match.s6_addr32[3] &= mask.s6_addr32[3]; 1350 1351 /* if you set extra bits, that's wrong */ 1352 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1353 return EINVAL; 1354 1355 cmp = 1; 1356 } else { 1357 if (cmd == SIOCGLIFADDR) { 1358 /* on getting an address, take the 1st match */ 1359 cmp = 0; /* XXX */ 1360 } else { 1361 /* on deleting an address, do exact match */ 1362 in6_prefixlen2mask(&mask, 128); 1363 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1364 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1365 1366 cmp = 1; 1367 } 1368 } 1369 1370 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1371 if (ifa->ifa_addr->sa_family != AF_INET6) 1372 continue; 1373 if (!cmp) 1374 break; 1375 1376 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1377 /* 1378 * XXX: this is adhoc, but is necessary to allow 1379 * a user to specify fe80::/64 (not /10) for a 1380 * link-local address. 1381 */ 1382 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1383 candidate.s6_addr16[1] = 0; 1384 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1385 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1386 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1387 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1388 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1389 break; 1390 } 1391 if (!ifa) 1392 return EADDRNOTAVAIL; 1393 ia = ifa2ia6(ifa); 1394 1395 if (cmd == SIOCGLIFADDR) { 1396 struct sockaddr_in6 *s6; 1397 1398 /* fill in the if_laddrreq structure */ 1399 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1400 s6 = (struct sockaddr_in6 *)&iflr->addr; 1401 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1402 s6->sin6_addr.s6_addr16[1] = 0; 1403 if (in6_addr2zoneid(ifp, &s6->sin6_addr, 1404 &s6->sin6_scope_id)) 1405 return (EINVAL); /* XXX */ 1406 } 1407 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1408 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1409 ia->ia_dstaddr.sin6_len); 1410 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1411 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1412 s6->sin6_addr.s6_addr16[1] = 0; 1413 if (in6_addr2zoneid(ifp, 1414 &s6->sin6_addr, &s6->sin6_scope_id)) 1415 return (EINVAL); /* EINVAL */ 1416 } 1417 } else 1418 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1419 1420 iflr->prefixlen = 1421 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1422 1423 iflr->flags = ia->ia6_flags; /* XXX */ 1424 1425 return 0; 1426 } else { 1427 struct in6_aliasreq ifra; 1428 1429 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1430 bzero(&ifra, sizeof(ifra)); 1431 bcopy(iflr->iflr_name, ifra.ifra_name, 1432 sizeof(ifra.ifra_name)); 1433 1434 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1435 ia->ia_addr.sin6_len); 1436 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1437 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1438 ia->ia_dstaddr.sin6_len); 1439 } else { 1440 bzero(&ifra.ifra_dstaddr, 1441 sizeof(ifra.ifra_dstaddr)); 1442 } 1443 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1444 ia->ia_prefixmask.sin6_len); 1445 1446 ifra.ifra_flags = ia->ia6_flags; 1447 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1448 ifp, td); 1449 } 1450 } 1451 } 1452 1453 return EOPNOTSUPP; /* just for safety */ 1454 } 1455 1456 /* 1457 * Initialize an interface's intetnet6 address 1458 * and routing table entry. 1459 */ 1460 static int 1461 in6_ifinit(ifp, ia, sin6, newhost) 1462 struct ifnet *ifp; 1463 struct in6_ifaddr *ia; 1464 struct sockaddr_in6 *sin6; 1465 int newhost; 1466 { 1467 int error = 0, plen, ifacount = 0; 1468 int s = splimp(); 1469 struct ifaddr *ifa; 1470 1471 /* 1472 * Give the interface a chance to initialize 1473 * if this is its first address, 1474 * and to validate the address if necessary. 1475 */ 1476 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1477 if (ifa->ifa_addr == NULL) 1478 continue; /* just for safety */ 1479 if (ifa->ifa_addr->sa_family != AF_INET6) 1480 continue; 1481 ifacount++; 1482 } 1483 1484 ia->ia_addr = *sin6; 1485 1486 if (ifacount <= 1 && ifp->if_ioctl) { 1487 IFF_LOCKGIANT(ifp); 1488 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1489 IFF_UNLOCKGIANT(ifp); 1490 if (error) { 1491 splx(s); 1492 return (error); 1493 } 1494 } 1495 splx(s); 1496 1497 ia->ia_ifa.ifa_metric = ifp->if_metric; 1498 1499 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1500 1501 /* 1502 * Special case: 1503 * If a new destination address is specified for a point-to-point 1504 * interface, install a route to the destination as an interface 1505 * direct route. 1506 * XXX: the logic below rejects assigning multiple addresses on a p2p 1507 * interface that share a same destination. 1508 */ 1509 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1510 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1511 ia->ia_dstaddr.sin6_family == AF_INET6) { 1512 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1513 RTF_UP | RTF_HOST)) != 0) 1514 return (error); 1515 ia->ia_flags |= IFA_ROUTE; 1516 } 1517 if (plen < 128) { 1518 /* 1519 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1520 */ 1521 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1522 } 1523 1524 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1525 if (newhost) { 1526 /* set the rtrequest function to create llinfo */ 1527 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1528 in6_ifaddloop(&(ia->ia_ifa)); 1529 } 1530 1531 return (error); 1532 } 1533 1534 struct in6_multi_mship * 1535 in6_joingroup(ifp, addr, errorp) 1536 struct ifnet *ifp; 1537 struct in6_addr *addr; 1538 int *errorp; 1539 { 1540 struct in6_multi_mship *imm; 1541 1542 imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1543 if (!imm) { 1544 *errorp = ENOBUFS; 1545 return NULL; 1546 } 1547 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1548 if (!imm->i6mm_maddr) { 1549 /* *errorp is alrady set */ 1550 free(imm, M_IPMADDR); 1551 return NULL; 1552 } 1553 return imm; 1554 } 1555 1556 int 1557 in6_leavegroup(imm) 1558 struct in6_multi_mship *imm; 1559 { 1560 1561 if (imm->i6mm_maddr) 1562 in6_delmulti(imm->i6mm_maddr); 1563 free(imm, M_IPMADDR); 1564 return 0; 1565 } 1566 1567 /* 1568 * Find an IPv6 interface link-local address specific to an interface. 1569 */ 1570 struct in6_ifaddr * 1571 in6ifa_ifpforlinklocal(ifp, ignoreflags) 1572 struct ifnet *ifp; 1573 int ignoreflags; 1574 { 1575 struct ifaddr *ifa; 1576 1577 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1578 if (ifa->ifa_addr == NULL) 1579 continue; /* just for safety */ 1580 if (ifa->ifa_addr->sa_family != AF_INET6) 1581 continue; 1582 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1583 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1584 ignoreflags) != 0) 1585 continue; 1586 break; 1587 } 1588 } 1589 1590 return ((struct in6_ifaddr *)ifa); 1591 } 1592 1593 1594 /* 1595 * find the internet address corresponding to a given interface and address. 1596 */ 1597 struct in6_ifaddr * 1598 in6ifa_ifpwithaddr(ifp, addr) 1599 struct ifnet *ifp; 1600 struct in6_addr *addr; 1601 { 1602 struct ifaddr *ifa; 1603 1604 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1605 if (ifa->ifa_addr == NULL) 1606 continue; /* just for safety */ 1607 if (ifa->ifa_addr->sa_family != AF_INET6) 1608 continue; 1609 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1610 break; 1611 } 1612 1613 return ((struct in6_ifaddr *)ifa); 1614 } 1615 1616 /* 1617 * Convert IP6 address to printable (loggable) representation. 1618 */ 1619 static char digits[] = "0123456789abcdef"; 1620 static int ip6round = 0; 1621 char * 1622 ip6_sprintf(addr) 1623 const struct in6_addr *addr; 1624 { 1625 static char ip6buf[8][48]; 1626 int i; 1627 char *cp; 1628 const u_int16_t *a = (const u_int16_t *)addr; 1629 const u_int8_t *d; 1630 int dcolon = 0; 1631 1632 ip6round = (ip6round + 1) & 7; 1633 cp = ip6buf[ip6round]; 1634 1635 for (i = 0; i < 8; i++) { 1636 if (dcolon == 1) { 1637 if (*a == 0) { 1638 if (i == 7) 1639 *cp++ = ':'; 1640 a++; 1641 continue; 1642 } else 1643 dcolon = 2; 1644 } 1645 if (*a == 0) { 1646 if (dcolon == 0 && *(a + 1) == 0) { 1647 if (i == 0) 1648 *cp++ = ':'; 1649 *cp++ = ':'; 1650 dcolon = 1; 1651 } else { 1652 *cp++ = ''; 1653 *cp++ = ':'; 1654 } 1655 a++; 1656 continue; 1657 } 1658 d = (const u_char *)a; 1659 *cp++ = digits[*d >> 4]; 1660 *cp++ = digits[*d++ & 0xf]; 1661 *cp++ = digits[*d >> 4]; 1662 *cp++ = digits[*d & 0xf]; 1663 *cp++ = ':'; 1664 a++; 1665 } 1666 *--cp = 0; 1667 return (ip6buf[ip6round]); 1668 } 1669 1670 int 1671 in6_localaddr(in6) 1672 struct in6_addr *in6; 1673 { 1674 struct in6_ifaddr *ia; 1675 1676 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1677 return 1; 1678 1679 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1680 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1681 &ia->ia_prefixmask.sin6_addr)) { 1682 return 1; 1683 } 1684 } 1685 1686 return (0); 1687 } 1688 1689 int 1690 in6_is_addr_deprecated(sa6) 1691 struct sockaddr_in6 *sa6; 1692 { 1693 struct in6_ifaddr *ia; 1694 1695 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1696 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1697 &sa6->sin6_addr) && 1698 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1699 return (1); /* true */ 1700 1701 /* XXX: do we still have to go thru the rest of the list? */ 1702 } 1703 1704 return (0); /* false */ 1705 } 1706 1707 /* 1708 * return length of part which dst and src are equal 1709 * hard coding... 1710 */ 1711 int 1712 in6_matchlen(src, dst) 1713 struct in6_addr *src, *dst; 1714 { 1715 int match = 0; 1716 u_char *s = (u_char *)src, *d = (u_char *)dst; 1717 u_char *lim = s + 16, r; 1718 1719 while (s < lim) 1720 if ((r = (*d++ ^ *s++)) != 0) { 1721 while (r < 128) { 1722 match++; 1723 r <<= 1; 1724 } 1725 break; 1726 } else 1727 match += 8; 1728 return match; 1729 } 1730 1731 /* XXX: to be scope conscious */ 1732 int 1733 in6_are_prefix_equal(p1, p2, len) 1734 struct in6_addr *p1, *p2; 1735 int len; 1736 { 1737 int bytelen, bitlen; 1738 1739 /* sanity check */ 1740 if (0 > len || len > 128) { 1741 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1742 len); 1743 return (0); 1744 } 1745 1746 bytelen = len / 8; 1747 bitlen = len % 8; 1748 1749 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1750 return (0); 1751 if (bitlen != 0 && 1752 p1->s6_addr[bytelen] >> (8 - bitlen) != 1753 p2->s6_addr[bytelen] >> (8 - bitlen)) 1754 return (0); 1755 1756 return (1); 1757 } 1758 1759 void 1760 in6_prefixlen2mask(maskp, len) 1761 struct in6_addr *maskp; 1762 int len; 1763 { 1764 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1765 int bytelen, bitlen, i; 1766 1767 /* sanity check */ 1768 if (0 > len || len > 128) { 1769 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1770 len); 1771 return; 1772 } 1773 1774 bzero(maskp, sizeof(*maskp)); 1775 bytelen = len / 8; 1776 bitlen = len % 8; 1777 for (i = 0; i < bytelen; i++) 1778 maskp->s6_addr[i] = 0xff; 1779 if (bitlen) 1780 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1781 } 1782 1783 /* 1784 * return the best address out of the same scope. if no address was 1785 * found, return the first valid address from designated IF. 1786 */ 1787 struct in6_ifaddr * 1788 in6_ifawithifp(ifp, dst) 1789 struct ifnet *ifp; 1790 struct in6_addr *dst; 1791 { 1792 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1793 struct ifaddr *ifa; 1794 struct in6_ifaddr *besta = 0; 1795 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1796 1797 dep[0] = dep[1] = NULL; 1798 1799 /* 1800 * We first look for addresses in the same scope. 1801 * If there is one, return it. 1802 * If two or more, return one which matches the dst longest. 1803 * If none, return one of global addresses assigned other ifs. 1804 */ 1805 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1806 if (ifa->ifa_addr->sa_family != AF_INET6) 1807 continue; 1808 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1809 continue; /* XXX: is there any case to allow anycast? */ 1810 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1811 continue; /* don't use this interface */ 1812 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1813 continue; 1814 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1815 if (ip6_use_deprecated) 1816 dep[0] = (struct in6_ifaddr *)ifa; 1817 continue; 1818 } 1819 1820 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1821 /* 1822 * call in6_matchlen() as few as possible 1823 */ 1824 if (besta) { 1825 if (blen == -1) 1826 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1827 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1828 if (tlen > blen) { 1829 blen = tlen; 1830 besta = (struct in6_ifaddr *)ifa; 1831 } 1832 } else 1833 besta = (struct in6_ifaddr *)ifa; 1834 } 1835 } 1836 if (besta) 1837 return (besta); 1838 1839 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1840 if (ifa->ifa_addr->sa_family != AF_INET6) 1841 continue; 1842 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1843 continue; /* XXX: is there any case to allow anycast? */ 1844 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1845 continue; /* don't use this interface */ 1846 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1847 continue; 1848 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1849 if (ip6_use_deprecated) 1850 dep[1] = (struct in6_ifaddr *)ifa; 1851 continue; 1852 } 1853 1854 return (struct in6_ifaddr *)ifa; 1855 } 1856 1857 /* use the last-resort values, that are, deprecated addresses */ 1858 if (dep[0]) 1859 return dep[0]; 1860 if (dep[1]) 1861 return dep[1]; 1862 1863 return NULL; 1864 } 1865 1866 /* 1867 * perform DAD when interface becomes IFF_UP. 1868 */ 1869 void 1870 in6_if_up(ifp) 1871 struct ifnet *ifp; 1872 { 1873 struct ifaddr *ifa; 1874 struct in6_ifaddr *ia; 1875 int dad_delay; /* delay ticks before DAD output */ 1876 1877 /* 1878 * special cases, like 6to4, are handled in in6_ifattach 1879 */ 1880 in6_ifattach(ifp, NULL); 1881 1882 dad_delay = 0; 1883 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1884 if (ifa->ifa_addr->sa_family != AF_INET6) 1885 continue; 1886 ia = (struct in6_ifaddr *)ifa; 1887 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 1888 nd6_dad_start(ifa, &dad_delay); 1889 } 1890 } 1891 1892 int 1893 in6if_do_dad(ifp) 1894 struct ifnet *ifp; 1895 { 1896 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1897 return (0); 1898 1899 switch (ifp->if_type) { 1900 #ifdef IFT_DUMMY 1901 case IFT_DUMMY: 1902 #endif 1903 case IFT_FAITH: 1904 /* 1905 * These interfaces do not have the IFF_LOOPBACK flag, 1906 * but loop packets back. We do not have to do DAD on such 1907 * interfaces. We should even omit it, because loop-backed 1908 * NS would confuse the DAD procedure. 1909 */ 1910 return (0); 1911 default: 1912 /* 1913 * Our DAD routine requires the interface up and running. 1914 * However, some interfaces can be up before the RUNNING 1915 * status. Additionaly, users may try to assign addresses 1916 * before the interface becomes up (or running). 1917 * We simply skip DAD in such a case as a work around. 1918 * XXX: we should rather mark "tentative" on such addresses, 1919 * and do DAD after the interface becomes ready. 1920 */ 1921 if (!((ifp->if_flags & IFF_UP) && 1922 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1923 return (0); 1924 1925 return (1); 1926 } 1927 } 1928 1929 /* 1930 * Calculate max IPv6 MTU through all the interfaces and store it 1931 * to in6_maxmtu. 1932 */ 1933 void 1934 in6_setmaxmtu() 1935 { 1936 unsigned long maxmtu = 0; 1937 struct ifnet *ifp; 1938 1939 IFNET_RLOCK(); 1940 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1941 /* this function can be called during ifnet initialization */ 1942 if (!ifp->if_afdata[AF_INET6]) 1943 continue; 1944 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1945 IN6_LINKMTU(ifp) > maxmtu) 1946 maxmtu = IN6_LINKMTU(ifp); 1947 } 1948 IFNET_RUNLOCK(); 1949 if (maxmtu) /* update only when maxmtu is positive */ 1950 in6_maxmtu = maxmtu; 1951 } 1952 1953 void * 1954 in6_domifattach(ifp) 1955 struct ifnet *ifp; 1956 { 1957 struct in6_ifextra *ext; 1958 1959 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 1960 bzero(ext, sizeof(*ext)); 1961 1962 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 1963 M_IFADDR, M_WAITOK); 1964 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 1965 1966 ext->icmp6_ifstat = 1967 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 1968 M_IFADDR, M_WAITOK); 1969 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 1970 1971 ext->nd_ifinfo = nd6_ifattach(ifp); 1972 ext->scope6_id = scope6_ifattach(ifp); 1973 return ext; 1974 } 1975 1976 void 1977 in6_domifdetach(ifp, aux) 1978 struct ifnet *ifp; 1979 void *aux; 1980 { 1981 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 1982 1983 scope6_ifdetach(ext->scope6_id); 1984 nd6_ifdetach(ext->nd_ifinfo); 1985 free(ext->in6_ifstat, M_IFADDR); 1986 free(ext->icmp6_ifstat, M_IFADDR); 1987 free(ext, M_IFADDR); 1988 } 1989 1990 /* 1991 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 1992 * v4 mapped addr or v4 compat addr 1993 */ 1994 void 1995 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 1996 { 1997 bzero(sin, sizeof(*sin)); 1998 sin->sin_len = sizeof(struct sockaddr_in); 1999 sin->sin_family = AF_INET; 2000 sin->sin_port = sin6->sin6_port; 2001 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2002 } 2003 2004 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2005 void 2006 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2007 { 2008 bzero(sin6, sizeof(*sin6)); 2009 sin6->sin6_len = sizeof(struct sockaddr_in6); 2010 sin6->sin6_family = AF_INET6; 2011 sin6->sin6_port = sin->sin_port; 2012 sin6->sin6_addr.s6_addr32[0] = 0; 2013 sin6->sin6_addr.s6_addr32[1] = 0; 2014 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2015 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2016 } 2017 2018 /* Convert sockaddr_in6 into sockaddr_in. */ 2019 void 2020 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2021 { 2022 struct sockaddr_in *sin_p; 2023 struct sockaddr_in6 sin6; 2024 2025 /* 2026 * Save original sockaddr_in6 addr and convert it 2027 * to sockaddr_in. 2028 */ 2029 sin6 = *(struct sockaddr_in6 *)nam; 2030 sin_p = (struct sockaddr_in *)nam; 2031 in6_sin6_2_sin(sin_p, &sin6); 2032 } 2033 2034 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2035 void 2036 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2037 { 2038 struct sockaddr_in *sin_p; 2039 struct sockaddr_in6 *sin6_p; 2040 2041 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2042 M_WAITOK); 2043 sin_p = (struct sockaddr_in *)*nam; 2044 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2045 FREE(*nam, M_SONAME); 2046 *nam = (struct sockaddr *)sin6_p; 2047 }
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